ART. 9. MINERALOGIC NOTES ON PUCHERITE, ETC._—_SHANNON. 3 
Measurements on elongated pyrite crysial from Arkansas. 
Measured. Calculated. 
No. | Form. Reflections. E: : nd 
ge p a) p 
Oye ° / or? ° / 
ear CL he CLA SOOG an a By acl oa 0 00 89 16 0 00 90 00 
2 | a (100) | Poor, blurred, two signals. -. .. 0 28 89. 17 0 00 90 00 
Si akloo) wiNiery goodeul:: Mees 2. ae. 0 00 89 25 0 00 90 00 
AaGs( L0G) oh GOOG ibe aoe S283 ook ayia aa ota ea 0 19 89 25 0 00 90 00 
5 | a (001) | Minute, reflection only.......-|........- OROOT Paes sk 0 00 
GEonalh) a ebixcelllemts 2s See ce cae 45 00 54 47 45 00 54 44 
Fh Mao GUTSY: ell os 6 Kata (0 Re ene a & & fet aE Bee, 44 52 54 39 45 00 54 44 
Ou (Md yn Bairegite Ma cette. seal 4510| 54391 4500| 54 44 
OF Gadd a Goode ci aeeBA Ss. eee BE 20 44 45 | 54 39 45 00 54 44 
In the other direction the crystals are flattened into moderately 
thin square tables of the habit illustrated in Figure 2. A crystal 
showing one of the numerous variations of the elongated cubocta- 
hedrons is illustrated in Figure 4. Not uncommonly crystals of mod- 
erate elongation are aligned into strings of individuals in parallel 
position as shown in Figure 5. Occasionally scepter crystals are 
thus formed by an equidimensional individual being perched atop a 
long prism. 
Variously elongated crystals of pyrite have been described from a 
number of localities, but crystals of such extreme deviation from 
normal symmetrical development are by no means common. Whit- 
lock! has figured greatly elongated cubes occurring in or with calcite 
and dolomite, from Rondout, Ulster County, N. Y. One of the illus- 
trated crystals. showed small octahedral planes and was thus very 
similar to those from Arkansas here described. Some of the New 
York crystals were twinned on the spinel law, giving unusual T and L 
shaped forms, and the terminal individuals of scepter crystals were 
oriented in twinned position. No definite twins could be found in the 
Arkansas specimen, certain pairs simulating twins being found to be 
only in accidental contact. 
The distorted octahedra from French Creek, Pa., described by 
Penfield,? are very different from these elongated individuals. 
PUCHERITE FROM MINAS GERAES, BRAZIL. 
A specimen (Cat. 94221) which has recentiy been received by the 
Museum from Mr. J. E. Carney, jr., through Mr. F. L. Hess, was 
identified by Mr. Hess as pucherite, the rare bismuth vanadate. 
Crystallographic measurements confirm Mr. Hess’s identification. 
1 Herbert P. Whitlock. Bull. New York State hfuseum No. 98, p. 6, 1995. 
2S. L.Penfield. On some curiously developed pyrite crystals from French Creek, Delaware County, 
Pa. Amer. Journ. Sci., vol. 37, p. 209, 1899. 
